Holder attachment



FIG. 1 is a perspective view of an holder attachment viewed obliquely from above and in an opened state;

FIG. 2 is a perspective view of the holder attachment of FIG. 1 as viewed obliquely from below;

FIG. 3 is a perspective view of the holder attachment, still opened, and viewed obliquely from below, from the opposite side as viewed in FIG. 1; and,

FIG. 4 is a perspective view of the holder attachment according to FIG. 1 in a closed state. 

I claim the ornamental design for an holder attachment, as shown. 